A demonstrator holds an image depicting Mexico's President-elect Enrique Pena Nieto, of the Institutional Revolutionary Party (PRI), that reads in Spanish "Authoritarian pig" during a protest against the official presidential election results in Mexico City, Friday, Aug. 31, 2012. On Friday, the Federal Electoral Tribunal declared Pena Nieto won the majority of votes in last July's presidential election, and he will be sworn-in on Dec. 1. (AP Photo/Alexandre Meneghini)

A demonstrator holds an image depicting Mexico's President-elect Enrique Pena Nieto, of the Institutional Revolutionary Party (PRI), that reads in Spanish "Authoritarian pig" during a protest against the official presidential election results in Mexico City, Friday, Aug. 31, 2012. On Friday, the Federal Electoral Tribunal declared Pena Nieto won the majority of votes in last July's presidential election, and he will be sworn-in on Dec. 1. (AP Photo/Alexandre Meneghini)